| 摘要 |
PROBLEM TO BE SOLVED: To optimally separate and synthesize a luminous flux of a wide angle of incidence in a prism. SOLUTION: A diffraction prism 15 of embodiments of the present invention is so constructed that a diffraction grid 21 is sandwiched between a pair of diffraction grid substrates 22, a pair of prism substrates 24 are bonded to the surfaces of the diffraction grid substrates 22 facing the diffraction grid 21 with interposition of flexible adhesive layers 23, and a diffraction grid medium 25 having a refractive index substantially equal to that of the prism substrates 24 is charged in a gap defined by the diffraction grid 21 and the diffraction grid substrates 22, with the respective component members being optically combined together. Thus, an incident light beam is led to the diffraction grid 21 and separated on transmission or reflection corresponding to a polarization direction by the operation of diffraction by the diffraction grid 21. COPYRIGHT: (C)2003,JPO
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